The other problem was getting Florence onto the Application Launch Bar. In the main menu she appears under “Universal Access” but this isn’t in the “Application Launch Bar Settings”. I found the solution on StackExchange, with one minor tweak. Where it mentions changes in

$HOME/.config/lxpanel/LXDE/panels/panel

you need to make those changes here:

$HOME/.config/lxpanel/LXDE-pi/panels/panel

Finally, if you want to adopt the same Raspberry coloured keys as I have, add a custom colour of #D62B4F. This is the colour of the official Raspberry Pi logo.